Althorp Papers. Vol. mmdcccii. Letters to Lady Bergavenny from: 1. Her son Edward, afterwards 15th Lord Abergavenny, circa 1712-1720. 2. William Osman, solicitor; 1717-1743. 3. Anthony Trumble, solicitor and estate steward; 1723-1731.
Althorp Papers. Vols. mmdccciii, mmdccciv. Financial, estate and legal papers; 1706-1737, n.d. Two volumes. Described in detail in NRA 10410, pp. 52-61.